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  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>99乘法表</title>
    <script>
      //99乘法表
      /*双循环
       *
       *
       */
      function outputMultiplicationTable() {
        //乘法表字符串
        var str = "";
        //外部循环
        for (var i = 1; i <= 9; i++) {
          //内部循环
          for (var j = 1; j <= i; j++) {
            //乘法表每个单项拼接
            str += j + "x" + i + " = " + i * j + " ";
          }
          str += "\n";
        }
        console.log(str);
      }
      outputMultiplicationTable();
      /*1x1 = 1 
        1x2 = 2 2x2 = 4 
        1x3 = 3 2x3 = 6 3x3 = 9 
        1x4 = 4 2x4 = 8 3x4 = 12 4x4 = 16 
        1x5 = 5 2x5 = 10 3x5 = 15 4x5 = 20 5x5 = 25 
        1x6 = 6 2x6 = 12 3x6 = 18 4x6 = 24 5x6 = 30 6x6 = 36 
        1x7 = 7 2x7 = 14 3x7 = 21 4x7 = 28 5x7 = 35 6x7 = 42 7x7 = 49 
        1x8 = 8 2x8 = 16 3x8 = 24 4x8 = 32 5x8 = 40 6x8 = 48 7x8 = 56 8x8 = 64 
        1x9 = 9 2x9 = 18 3x9 = 27 4x9 = 36 5x9 = 45 6x9 = 54 7x9 = 63 8x9 = 72 9x9 = 81
       */
    </script>
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